Impboved machine foe sharpening saws



@uiten faire getint @Hire IMPROVED vMACHINE FOB. SHABPENING SAWS.

JOHN VBOR'IHI/i/'ICK 0F PHILADELPHIA, PENNSYLVANIA. Letters PatentNo. 59,950, dated November 27, 1866. i

i SPECIFICDION. 'ro ALL wHoMv 1T MAY coNonnN:

Be it known that I, JOHN BORTHWICK, of the city and county of Philadelphia,` in the `State of Pennsylvania, have inventeda new and improved'mode of Sharpening Saws and I do' hereby declare4 that the following is 3 a full, clear, and exact description of the construction and operation of. the same, reference" being yhad to fthe annexcddrawings making apart of this specification, in which- Figures 1 and 1 (bis) are a perspective view of my solid eme'ry ring or' rim, R, 'and flange, K, and metallic i ring washer, P.

Figure 2 is a side eleva/tion of the whole saw sharpener, showing a sectional elevation of my emery ring 1 or` rim as held by flange K, and plate or washer P.

Figure 3 is an end elevation of the saw Sharpener, showing in full my emery ringA or, rim, R, and also my 3 A improved rest, by means of which, as will be hereafter described, the saw can be presentedto the emery ring or rim in any desired position,'as shown by the red lines, (iig. Figure 4 is a perspective view of v.my improved rest.

l The nature of my invention and improvement consists inthe use of solidnemery rings or'rims, `instead of solid emery wheels or files, for 'sharpening saws, 4and of a'hinged rest, which, by -m'eans of ascrew acting under the restsl hinged top plate, permits to present the saw to 'the sharpening ring or rim at any desiredangle or bevel; the whole arranged and operating as follows: I use a solid emery ring, R, or rim, R', which I place on 1 ange K, made to fit into the inside of my ring or rim. On the opposite face of the ring or rim Ipla'ce ai metallic ring washer, P; and screws B B B, passing through said washer into iiange K and in holes' N, will hold" the whole combination together, firm, steady, as one solid piece, and ready4 to be used en any mandrel, E, as

shownin g. 2, M M. The advantages of asolid ring'or rim over the solid wheel are that it s avesmaterial, and l is thus much cheaper, and permits, also, to use'the ring until it is worn out to, say, one quarter of an inch of its inside periphery; whereas the solid wheel, past a certain point of wear, ca nnot be used at all.` i I also use a rest, which Iterm a hinged rest, and which is made as shown in g, figs. 3 and 4. The top plate, g2 g2, of the rest is attached to' thebody of the' same by'means of ordinary hinges, H, and Arest in `any desired positionf on end of hand-screw y y; said screw passing and acting through lug :v which is rivetted in proper place` on head Aof rest g. The top of `top plate g2 must be on a level with centre of mandreLE E, omwliich the, sharpening ringer rim, `prepared as above mentioned, has been attachedand when the teeth of thesaw should@ be sharpened straight across, the top plate should stand horizontal or `form'a right anglewith head `of rest; .but when said teeth have to be'sharpened` or bevelled at a certain angle, the screw, yy, should -be screwed-orf unscrewed so as to bring the top plate tothe desired angle, after which operation any hand, however inertperieneed, I may want to employa child, evenwill be able to use the rest to advantage and sharpenV ,thesaw to the desired angle. To thebed plate D D of headV Y Y, (iig. 2,) I attache. plate,-L, by means of` screws 0; said plate to be the bed plate, on to' which I place and fasten my rest, as shown in figs; 3 and4, by means of hand-screw'z. Said screw passes through slot z, iig. 4, so as to' allow the whole restto be placed at any desired; distance 1from the periphery'of the emery ring' or rim. I scarcely need mention that, like any other grinding` or sharpening wheels, my emery ring or rim ismade to revolve with velocity by means of a `belt passing oni pulley a a, and connecting the Sharpener with suitable motive power. `Two main advantages are derived from my improvements. Economy, by using a solid emery ring or rim, which can be obtained at a lesser costi and used up to the very edge. Time saving, in that with my hinged rest a child or any inexperienced hand can use the Sharpener to advantage. I v i Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, isf- 1. The solid emery ring or rim, of any suitable size, for the purpose of sharpening saws, `combined withi flange K and plate P, and arranged substantially as herein described. i

2. The combinationof the hinged rest, g, construct d as described, with screws y y, andlbed plateL, fori the purpose as above described. p

3. The combination of the emery ring with the rest, screws,and lbedplates 'as hereinldescribed and set forth. l .x s

l* BORTHWICK.`

Witnesses v C. D. COLLADAY, It. M. HAMLEY. 

